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This makes Refresh use the trailing NTB for high-contrast RTL on Windows, where
we draw with the native frame and the caption buttons are on the right (i.e.
leading) edge.

BUG=822063
TEST=none

Change-Id: I92b58e1db4aef83d76e6e64abb93f9549db84067
Reviewed-on: https://chromium-review.googlesource.com/1029197Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553848}